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How do you tell when to use Rsin/Rcos formulas? watch

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    For example, on WJEC C4 June 2005, 4b. it does not say that you must answer by using Rsin.
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    When you have an expression like cosx-3sinx=2
    It may seem difficult to solve if you try any other method. You are basically converting expressions with sines and cosines into a single trig expression.
 
 
 
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Updated: June 12, 2016
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